It looks as if this used to be a feature but possibly was removed? And I am having a hard time finding it now if it still exists. It doesn't appear in the API.
I am currently evaluating solutions like forem.dev where each topic is treated more as a blog post and rather than categories, they have "tags". I like these aspects, but I also love that this is NodeBB and I feel fairly confident I can develop for this platform, where Forem is a ruby rails app.
I'm wondering with theming how close NodeBB could emulate forem.dev. I suspect it would not be difficult.
If thumbnails do not exist, can a plug-in augment api data? And if so, would anyone suggest a plug-in to look to for inspiration?